I am happy you've decided to get a puppy, and are going about doing it in a responsible way. I'm not much of an expert on these things, but Vela, Karen, .sarah, and others have given you good advice.

I woulden't put you down for not adopting from a shelter, because if I did, then I would be a hypocrit! I can understand adopting from shelters is much harder then it seems sometimes...

Good Luck, and can't wait to see what you've chosen!